Compression on the SIX, what do you think? Options

[Trekkor]

1. 162
2. 155
3. 148
4. 145
5. 140
6. 162

Not too alarming, is it?

KT

[iiibdsiil]

It's hard to say what the PSI should be at because I don't know the compression for your motor, or the conversion from a ratio to psi...

25% sounds pretty high though to me... When I checked my motor I was within 9 psi on all 6 cylinders. I can't remember for the life of me what PSI it was, but I am sure it is higher than yours.

25% might be acceptable, I guess. I mean, it all depends on what your tolerances are. Same thing with alignments, the factory has a broad spec, and if you don't care, you take it to the alignment shop and say align it, if you do care, you watch over them, and tell them that you want it closer.

I'm not sure on the story of your motor, haven't been paying attention at all, but if it was a freebie or you didn't spend a whole lot, then run it and enjoy it. If you want it to be closer to perfect, then worry about it.

But, you need to do the compression check right first, all plugs out, WOT. If readings are still varying like that, put a couple drops of oil in the cylinder, and see if that helps. If not, get an adapter and do a leak down test. If you hear air coming out of the exaust, you have an exaust valve that is screwed up, coming out the intake, I bet you can figure that one out. And if you hear it out the oil cap, or however you can hear the crank case on a 911, then it is rings whatever else would allow air into the crank case.